SU366215A1 - ALL-UNION - Google Patents

Description

STABILIZED POLYURETHANE COMPOSITION

one

This invention relates to the preparation of polyurethan based compositions.

A polyurethane composition is known, consisting of a polymer, 2,5-dialkylhydroquinone, an aromatic phosphite and a light stabilizer. However, this composition does not prevent the destruction of polyurethane from natural factors of action.

The purpose of the invention is to increase the effect of stabilization and to expand the range of polyurethane stabilizers.

This is achieved by introducing into the polyurethane composition a mixture of stabilizers for various purposes (in the amount of 0.5-1 parts by weight of each per 100 parts by weight of polyurethane):

}) an antioxidant consisting of a mixture of bist (5-methyl-3-a-methylbenzyl-2-hydroxyphenyl) monosulfide with a mixture of 4- (a-methylbenzyl) phenylphosphite isomers, 2.4 hdi- (a-methylbenzyl) phenylphosphite and 2 , 4, b-tri- (a-methylbenzyl) phenylphosphite at a molar ratio of bis (5-methyl-Z-Methylbenzyl-2-hydroxyphenyl) my sulfide isomer mixture of 1: 1;

2) antiozonant-tributylthiourea;

3) protivouvomitel-b "c- (2-hydroxy-For-methyl-cyclohexyl-5-methyl-phenyl) -methane;

4) a light stabilizer consisting of a mixture of 1,3-di- (4-benzoyl-3 hydroxyphenoxy) propanol-2 with a Ni salt of the diophenyl thiophosphoric acid ester in a molar ratio of 1: 1.

Films based on a stabilized polyurethane composition can be used to protect products from the effects of natural factors.

PRI and MER. A mixture of bis- (5-methyl-3-Methylbenzyl2-hydroxyphenyl) monosulfide and phenylphosphite is preliminarily prepared. For this purpose, 4.54 g (0.01 mol) of the first component and 9.35 g (0.01 mol) of the second component are removed and transferred in a medium of a volatile solvent until a homogeneous mass is obtained and the solvent is completely removed. Next, prepare a light stabilizer consisting

from a mixture of 1,3-di- (4-benzoyl-3 hydroxyphenoxy) propanol-2 with the Ni salt of the thiophosphoric acid didecyl ester, for which 1.504 g of the first component (0.01 mol) and 8.778 g (0.01 mol) are taken the second. Stir thoroughly until the solvent is completely removed. In a polyurethane solution consisting of 100 wt. including polyurethane, 10 wt. including polyvinyl chloride, 390 wt. including dimethylformamide and 10 wt. including water, enter prepared as a thioxidant, antnozonant, an anti-agitator and a light stabilizer at the rate of 0.5-1 wt. hours each 100 weight. including polyurethane.

Then, porous films are prepared by coagulating the obtained solutions in 30% aqueous solution.

dimethylformamide solution. Films exist

at room temperature until moisture is completely removed (visually).

The criterion for the effectiveness of stabilizers is the change in the physicomechanical parameters of the films before and after aging (especially relative elongation as the most sensitive indicator of aging) in the IP-1-3 artificial weather apparatus during 84 and 150 hours.

The test results of physical and mechanical properties of films based on the known and proposed stabilized polyurethane compositions are given in the table.

Subject invention

A stabilized polyurethane composition based on a mixture of polyurethane and stabilizers, characterized in that, in order to increase the effect of stabilizing and expanding the range of polyurethane stabilizers, as stabilizers are used

a mixture consisting of a mixture of bis- (5-methyl-3-amethylbenzyl-2 hydroxyphenyl) monosulfide with a mixture of isometers 4 (a-methylbenzyl) phenylphosphite, 2,4-di- (a-methylbenzyl) phenylphosphite, 2, 4, 6 - three (a-methyl.ben1syl) phenylphosphite at a molar ratio of bs- (5-methyl-Zamethylbenz, yl-2 oxyfepyl) monosulfide to the mixture isomerO: B 1: 1; tributylthiourea; Bis (2-hydroxy-Z-methyl-diclohexyl-5; methyl-phenyl) -methane and a mixture of 1,3-di- (4-benzoyl-3 hydroxy-5-phenoxy) propanol-2 with a Ni-salt of the didecyl ester of thiophosphoric acid in molar the ratio of 1: 1; moreover, stabilizers are applied in the amount of 0.5-1 wt. h. each 100 weight. h polyurethane.